Lunch box



FIG. 1 is a front, top and left side perspective view of a lunch box showing my new design;

FIG. 2 is a right side elevational view;

FIG. 3 is a rear elevational view;

FIG. 4 is a front elevational view; and

FIG. 5 is a bottom plan view. 

The ornamental design for a lunch box, as shown. 